Update Pyodide to v0.26.3

[riyavsinha]

Change Summary

Update Pyodide v0.26.3, update emscripten version. I followed #1199 closely.

I understand that I will need to update https://github.com/samuelcolvin/mkdocs-run-code as well after this.

Related issue number

#1506

Checklist

• Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

[codspeed-hq]

CodSpeed Performance Report

Merging #1507 will not alter performance

_{Comparing riyavsinha:main (e14b93b) with main (9b21b0f)}

Summary

✅ 155 untouched benchmarks

[davidhewitt]

Thanks!